[FFmpeg-user] dvdsub scaling 'fatness' work around?

[Devin Heitmueller]

On Fri, Jul 25, 2025 at 1:22 PM Mark Filipak <markfilipak.imdb at gmail.com> wrote:
> No, SAR is 32/27, so DAR is 16/9. FFmpeg should scale just the same as a
> player does [note], and then pad to 1920x1080. FFmpeg appears to
> mis-scale the RLE subtitles (i.e. dvdsub), or, at least, to get the new
> run lengths wrong -- a guess because I have no way to actually see the
> run length numbers. (You know, now that I'm thinking about it more, I
> don't know whether the problem is with FFmpeg's scaling or with the
> players.)

It would be helpful if you could provide an actual ffmpeg command line
demonstrating what you're trying to do.  If you're just passing the
dvdsub data through to the MP4 unmodified, then it's entirely possible
that it's just the player that doesn't know how to render them over
16:9 video.

Devin

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Devin Heitmueller, Senior Software Engineer
LTN Global Communications
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